Pneumatic pumping apparatus.



H. SMALL.

PNEUMATIC PUMPING APPARATUS.

APPLICATION FILED NOV. 11. 1910. RENEWED FEB. 12,1916.

1,199,030. Patented Sept. 19, 1916.

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PNEUMATIC PUMPING APPARATUS.

APPLICATION HLED NOV. 11-. 191o. RENEWED FEB. 12. 19l6.

1 ,1 99,030. Patented Sept. 19, 1916.

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PNEUMATIC PUMPING APPARATUS. APPLICATION FILED NOV. 11; 1910. RENEWED FEB. $2.191e.

Patented Sept. 19, 1916.

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Witnesses Howard Smwib what WMKL 195/ 71-66 flttomey Milt fiaadww UNITED STATES PATENT OFFICE.

HOWARD SMALL, .OF ATLANTIC CITY, NEW JERSEY, ASSIGNOR TO JAMES HFIBELL, OF PHILADELPHIA, PENNSYLVANIA.

PNEUMATIC PUMPING APPARATUS.

Specification of Letters Patent.

Patented Sept. 19, 1916.

Application filed November 11, 1910, Serial No. 591,760. Renewed February.12, 1916. Serial No. 78,069.

T 0 all whom it may concern:

Be it known that I, HOWARD SMALL, a citizen of the United States, residing at Atlantic City, in the county of Atlantic and State of New Jersey, have invented certain new and useful Improvements in Pneumatic Pumping Apparatus, of which the following is a specification.

My invention relates to a pneumatic pumping apparatus in which the inclosing casing forms a vacuum chamber, which is connected, by tubing or hose, With any desired type of suction nozzle or sweeper adapted to be employed for cleaning carpets and the .like.

One object of my invention is to prov1de .a novel form ofpumping mechanism, which is located Within the vacuum chamber, and comprises two pumping or pulsation chambers, preferably opposed to each other and connected together by tubes which form a support and also means of communication between the same.

A further object of my invention is to provide a vibrating member in each of the pulsation chambers and a motor suitably connected with said vibrating members for operating the same.

A still further object of my invention is to provide a single inlet valve in one ofthe pulsation chambers to supply air to both of I employ a plurality of pulsationchambers, the fluid passing from one pulsation chamber through the other pulsation chamher to the atmosphere or adesired point of utilization. 7

i In order that those skilled in the art will be able to readily comprehend my invention I have shown different adaptations of my invention to illustrate some of the ways in which my invention may be practically carried out and advantageous results ob tained but as' will be apparent the arrangement of the instrumentalities employed may be varied and still be within the spirit and scope. of the invention.

Figure l is a sectional elevation of a pumping apparatus embodying my invention; Fig. 2 is a vertical section on line 22 Fig. 1; and, Fig. 3 is a sectional elevation of another embodiment of my invention.

Similar numerals of reference indicate supported by legs 10 and'provided with bolts 12, having nuts 13 for engaging projecting-lugs 14, upon' the collar 15, secured to the lower end of the casing 1, whereby the base 3 and the casing 1, may be clamped together and made air-tight by a suitable gasket 16.

The upper portion of the casing 1 is provided with a collar 18 which is secured to said casing, and said collar is provided with bolts 19 and nuts 20 for clamping the cover 4 to the casing. Between the cover and the collar 18 on the casing is clamped the outwardly turned flange of the sleeve 22, which supports the separating device 6. Gaskets 23 and 24 are clamped between the said parts to make the joints air-tight.

The cover 4 receives the inlet pipe 26 and the elbow on the end of the said pipe 26 is turned so as to deliver the inrushing air tangentially against the depending flange 28, secured to the under side of the cover.

The separating device consists of the above described sleeve 22', to which is attached a bag 6, preferably made of fabric, for the purpose of filtering the dust laden air and thereby purifying it. At the bottom of the separating device is provided a wire ring 29, for the purpose of keeping the fabric extended and also for the further purpose of preventingthe separating device from being pressed against the wall of the casing. It is desirable that the air passing through the separating device shall pass through the sides thereof to a free passage chamber and it is made sufliciently short inthe present instance to form a space below it for the free passage of air.

The vacuum chamber contains the pump ing casing 7, which in this embodiment is supported upon the base 3, which latter may if desired form the lower portion of the pumping mechanism.

The pumping mechanism consists of a plurality of pulsation chambers and for purposes of illustration I have shown two pulsation chambers 30 and 31 which are connected by passageways or tubes 33, which permit the free passage of air or fluid between said chambers. The shells, 35 and 36, forming the pulsation chambers 30 and 31, are rigidly secured together by means of bolts' '38, which engage the top surface of the upper shell 35 and the bottom surface of the lower shell 36 and pass through the tubes 33, thus clamping the parts rigidly to ether.

be motor 8 is located between the pulsation chambers 30 and 31 and is mounted upon a base 40, having legs 41, which latter rest upon or form part of the ring 42, which is secured to the upper surface of the shell 36 of the lower pulsation chamber 31. The legs 41 are curved to form ample space for the movements of the vibrating member 45, of the lower pulsation chamber 31.

The upper pulsation chamber 30 is provided with a valve 46 of any desired type and the lower pulsation chamber 31 is provided with a valve 47 of any desired type. Said valves are similar in construction in the present instance and consist of a rigid disk 48, preferably made of metal, and a flexible disk 49 preferably made of leather. Each of the disks 48 and 49 has apertures 50 and 51 respectively formed therein, and arranged in staggered relation so that when the flexible disk 49 is in contact with the metal disk 48 the, apertures 50 in the rigid disk 48 will be closed by the solid portion of the flexible disk 49, thus forming a checkvalve which acts automatically.

' When the higher pressure is upon the side of the valve, where the flexible disk is located, the valve will close, and when the higher pressure is upon the side of the valve, where the rigid. disk is located, the valve will open and allow the air to flow through the same. The parts of said valves are clamped together by screws 53 or other suitable fastening devices. There is provided a supporting-web 54, located a short distance from the leather disk 49, to prevent the same from having too much movement.

The under side of the shell 35 of the upper' pulsation chamber 30 and the upper side of the shell 36 of the lower pulsation chamber 31, are each provided with circular openings, which are closed by the vibrating members 45 and 55. The vibrating members 45 and 55 are similar in construction and each consists of a disk 57, to which is clamped a erably of leather.. The outer edge of the diaphragm 58 is secured to the pulsation chamber by means of metal rings 42 and 59, held rigidly by screws 60, or other fastening devices, and the inner edge of the diaphragm 58 is secured to the disks 45 and 55 by means of rings or collar 61, securedbry screws 62, or other suitable fastening means. The flexible diaphragms 58 permit the disks to vibrate freely.

The disks 45 and 55 are provided with lugs 63 and 64 having stud-shafts 65 and 66, to which are operatively connected the ends of the connecting-rods 68 and 69, the opposite ends of the latter embracing eccentrics 70 and 71, upon' the motor shaft 73. The ends of the connecting-rods are preferably connected with the stud-shafts 65 and 66 in such a manner that a non-pivotal connection is formed although slight relative lateral The air discharging from the pump may.

exhaust directly to. the atmosphere or if desired a casing 74 may be employed which is retained in assembled position by .the rods 38 and provided with ports 75 therebyserving as a muffler.

In the embodiment seen in Fig. 3 I have shown'the pump unit as supported in a novel manner and a different manner of separating the impurities fromv the air. Since many of the parts seen in Fig. 3 correspond to those seen in Figs. 1 and 2, I

, flexible collar or diaphragm 58, made prefhave designated like parts by their corresponding reference characters and I have deemed it unnecessaryto describe in detail such construction as the same would in volve needless repetition.

76 designates the inlet port which is adapted to receive the suction hose, the air passing tangentially into the vacuum chamber 12, the lower end of which is closed by the end member 7 S, suitably connected with the legs 10 and preferably of conical form so that the dust and foreign material separated from the air may be readily removed ed a prefera-blyresilient ring 85 to which a suitable skeleton framework 86 is connected over which the filtering material 6 is stretched in order to give greater area to the filter and to cause the dust and dirt to fall from the separating device by gravity into the precipitation chamber formed by the base of the machine. Inthis embodiment the pump unit is suspended within the vacuum chamber and in order to illustrate one manner of accomplishing this I have shown the pump unit as having a cross-bar 87 retained in position by the fastening devices 53 and adapted to receive an eye-bolt or connection 88 to which one end of a spring 89 is secured, the other end of such spring being secured to a cross-bar 90 which is held in position by fastening devices 91, the latter also serving to hold in position the flexible member 92, the outer periphery of which is secured by means of suitable fastening devices 93 with a flexible member 9f, the inner periphery of which latter is secured to the pump unit by means. of the fastening devices 53. The cover in this case is provided with a discharge opening 95 which if desired'may be covered by the muiller casing 7%. The purpose of the spring 89 is to support the pump unit in invention the pump unit is yieldingly suspended in the vacuum chamber and is not necessarily carried by the casing cover as shown.

The operation of the embodiment of my invention seen in Fig. 1 is as follows: A

pipe or flexible hose having an ordinary suction nozzle or sweeper at its end is connected with the intake pipe 26 of the vacuum cleaner. The motor contained within the casing 1 is rotated by connecting the same with an ordinary electric lighting circuit for its source of current. The vibrating members of the pumping device are reciprocated rapidly, by the connecting-rods upon the shaft of the motor. The effect of this is to force the air from the two pulsation chambers 30 and 31 of the pumping device, out through the exhaust valve 47, thus reducing the air pressure in the pulsation chambers which will cause the air at atmospheric pressure in the vacuum chamber to open the inlet valve 46, causing a vacuum in said vacuum chamber which will draw the dust laden air through the intake pipe 26, which will strike tangentially against the flange 28, upon the cover and thus avoid injuring the fabric of the separator. The dust is collected upon the inner -surface of the separator and the air purified by being strained through the fabric of the separators, through which latter it freely passes to the inlet valve 46 of the pumping device from which it escapes into the chamber 70 in case such is employed, the same acting as a mufller to reduce the sound of the escaping air.

The cover may be readily removed by loosening the thumb-nuts and the separating device may be lifted from the casing for the purpose of removing the dust that has.

been collected withinthe same. v

By my improved construction of the pumping device it will be noted that there are. no valves in the vibrating members and that they, therefore, together with the connecting-rods, can be constructed in such a.

eludes the novel feature of a plurality of pulsation chambers, each operating-with a vibrating member, said chambers hav ng free communication each with the other, and

using preferably only one set of valves, inletand outlet, for the plurality of chambers. This is conducive to simplicity of construction and facilitates a balanced operation of the motor as related to thepumping mechanism, inasmuch as the load is equalized from both sides of the motor shaft and at the same time the pressure or load contributed by each of the pulsation chambers is equal, owing to the fact that they freely communicate and the air pressure or load in each pulsation chamber is equalized by the freely communicating passages.

The motor being located between the two pulsation chambers and the fact that the eccentrics are so set that the vibrating members move simultaneously in opposite directions one up and one down, the effect is to cause the pulsation chambers to act in unison, whereby at one stroke of the vibrating members the two pulsation chambers are filled with air from the vacuum chamber 7, taken through the valve 46, located in the top of the upper pulsation chamber, thus filling the upper chamber 30 and through the pipes 33, also the lower pulsation chamber 31, and with the reverse action of the connecting-rods and vibratin members, dircharging the contents of both pulsation chambers 30 and 31 from the lower pulsation chamber through the single valve 47 located in the lower part of the lower pulsation chamber 31. The contents of the upper pulsation chamber being discharged through the tubes 33, heretofore mentioned, through the lower pulsation chamber 31, simultaneously with the contents of the lower pulsation chamber and through the exhaust valve 47 at atmospheric pressure, either direct to atmosphere or through the casing 7 4 having small apertures 7 5. The casing 74 is secured to the under side of the base 3 and acts as a muffler, to equalize the discharge of air and thereby prevent noise. The chamber 74: is not intended to be used as a pressure chamber but as a mufiler only and may be dis pensed with if desired.

In the embodiment seen in Fig. 3 the dust laden air enters tangentially through theinlet 76 and passes through the dust separating device 6, the heavier particles falling by gravity to'the bottom member 78, this action being facilitated owing to the variations in pull on the filtering fabric due to the fluctuations in the vacuum. The air in its purified condition passes through the pump in the same manner as hereinbefore described and thence through the port 95 to the atmosphere or point of utilization.

If each pulsation chamber were an independent pump, having an inlet and an outlet valve there would at all times be a difference in the load, owing to the fact that it would not be practical to have the valves of each pump operating exactly the same. Therefore, it would be certain that in practical operation, one pump would-,be doing more work than the other, and the opposing loads as related to the motor would be unequal, which would contribute to strain and y vibration.

It has been demonstrated that for practical purposes there is a limitation to the size of the diaphragm pump, both as to stroke and as to the diameter of the pump itself.

The stroke of the diaphragm pump is lim ited, but for practical purposes, owing to. the fact that the length of the stroke must be provided for, slackness in the leather or othersuitable material of which the diaphragm is formed, is provided to allow for the movements of the vibrating member and too much slackness in the diaphragm makes the latter undesirable. Furthermore, a long stroke of the vibrating member at high speed is impracticable, owing to both the oscillation of and the slackness in the leather, and decreases the efficiency of the pump, creating a pocket which does not discharge proportionately the volume of air as you. increase the length of the stroke. Furthermore, the

kinking of the leather'of the diaphragm, which is caused by its varying positions, inv cidental to a long stroke, would soon destroy the leather and in a long stroke you get greater weight and more inertia to overcome.

There are also limitations to the diameter of the diaphragm pump:

First. For the reason that as you increase the area of the vibrating member at a given vacuum, the pressure on the vibrating member increases in proportion to the increased area of the vibrating member, and this increased load contributes to vibration and the destruction of the pump and motor.

Second. Thev increased area of the vibrating member necessitates, owing to the greater load, heavier moving parts throughout, including connecting-rods and vibrating member, which causes increased oscillation and inertia which have to be overcome. It further requires a heavier leather in the diaphragm to such anextent as to make the durability of the leather diaphragm questionable under such increased loads. For the above mentioned reasons, in .order to gain greater volume and increased working 1 I I know the manner in which this is accomplished is entirely novel with me, and my claims are therefore to be construed with corresponding scope.

In both the embodiments of my invention I employ a pumpunit located in the vacuum chamber and provided with a plurality of independent and freely communicating pulsation chambers, between which the motor is located to actuate a vibrating member for each pulsation chamber and the pumping mechanism and motor may be bodily removed from the casing as a unit.

Having thus described my invention I claim and desire to secure by Letters Patent, is

1. In a device of the/character described, the combination of an inclosure forming a vacuum chamber, a plurality of freely communicating pulsation chambers in communication with the vacuum chamber, a vibrat- .vacuum chamber, a plurality of freely communicating pulsation chambers; one of said pulsation chambers being located within said vacuum chamber and in communication therewith, a vibrating member for each of said pulsation chambers, actuating means .15 -forithe vibrating members, and-val-ve meehanism controlled by the pulsation chambers. 3. In a device of the character described, -the combination of an inclosure forming a vacuum chamber, a plurality of pulsation 0 chambers one of which is in communication with said vacuum chamber, a tube connecting said pulsation chambers and forming free communication therewith, a vibrating member for each of said pulsation chambers, actuating means for the vibrating members,

and valve mechanism controlled by the pulsation chambers.

4:. In a device of the character described, the combination of an inclosure forming a $0 vacuum chamber, two freely communicatin pulsation chambers in communication wit the said vacuum chamber, tubes forming a means of communication between said pulsation chambers, said tubes forming a means of support for one of said pulsation chambers, a base to support the other one of said pulsation chambers, a vibrating member for each of said pulsation chambers, actuating means for the vibrating members,-and- 40 valve mechanism controlled by the pulsation chambers. v

5. In a device of the character described,

the combination of an inclosure forming a vacuum chamber, tw'o freely communicating pulsation chambers in communication with the said vacuum chamber, tubes torigidly hold said pulsation chambers together and forming a means of communication between said pulsation chambers, means for supporting said pulsation chambers within said in closure, a vibrating member for each of said pulsation chambers, actuating means for the said vibrating members, and valve mechanism controlled by the pulsation chambers.

6. In a device of the character described, the combination of an inclosure forming a vacuum chamber, two freely communicating pulsatiomchambers in communication with the said vacuum chamber, tubes between said pulsation chambers, bolts to clamp said pulsation chambers against the ends of said tubes, said tubes forming a means of communication between said pulsation chambers, means for supporting said pulsation chambers within said inclosure, a vibrating member for each of said pulsation chambers, actuating means for the said vibrating members, and valve mechanism con trolled by the pulsation chambers.

7. In a device of the character described, the combination of an inclosure forming a vacuum chamber, two freely'communicat ing pulsation chambers in communication with the vacuum chamber, a vibrating member for each of said pulsation chambers, a motor, suitable connections between said motor and said vibrating members and valve mechanism controlled by the pulsation chambers.

8. In a device of the character described, the combination of an inclosure forming a vacuum chamber, two freely communicating pulsation chambers in communication With the vacuum chambers, a vibrating member for each of said pulsation chambers, a motor within the vacuum chamber, a shaft for said motor, eccentrics on said shaft, connectingrods for said eccentrics and non-pivotally secured to said vibrating members and valve mechanism controlled by the pulsation chambers.

9. In a device of the character described, the combination of an inclosure forming a vacuum chamber, two freely communicating pulsation chambers in communication with the vacuum chamber, a vibrating member for each of said pulsation chambers, a

motor, a shaft therefor, eccentrics on said shaft, connecting-rods between said eccentrics and said vibrating members, said eccentrics being mounted upon said shaft in such a position that said vibrating members will be actuated simultaneously in oppposito directions, and valve mechanism controlled 0 by the pulsation chambers.

10. In a device of the character described, the combination of an inclosure forming a vacuum chamber, two freely communicating pulsation chambers in communication with the vacuum chamber, a vibrating member for each of said pulsation chambers, a motor, a bearing supporting said :motor in central alinement with the said vibrating members, suitable connections between said motor and 15 sald vibrating members, and valve mechanism controlled by the pulsation chambers.

11. In a device of the character described, the combination of an inclosure forming a vacuum chamber, two freely communicating pulsation chambers in communication with the vacuum chamber, a vibrating member for each of said pulsation chambers each consisting of a solid disk and a flexible diaphragm connected therewith, a motor 5 located intermediate said pulsation cham bers, connecting-rods operatively connected between said motor and said disks and valve mechanism controlled by the pulsation chambers. 1 3 0 I13, In a device of the character described,

the c ombinatiQiL of a casing forming a vacuum chamber, fivofreely communicating pulsation chambers in comrminicatien with the vacuum chamber and yieldingly mounted therein, a casing forming a muflier, a motor, suitable connections between said motor and said vibrating members and valve mechanism controlled by the pulsation chambers. 14. In a device of the character described, the combination of a casing forming a vacuum chamber, two freely communicating pulsation chambers in communication with the vacuum chamber, a vibrating member for each-pulsation chamber, a separating device in said vacuum chamber, a motor, suitable connections between said motor and said vibrating members and valve mechanism controlled by the pulsation chambers.

15. A pump having a plurality of pulsation chambers in free communication with each other, a pumping member for each pulsation chamber, valve mechanism for the pulsation chambers consisting of a single inlet and a single outlet valve, the inlet valve cotiperating with one pulsation chamber and the outlet valve cotiperating with the other pulsation chamber, and actuating means for said pumping members.

16. A pump having a plurality of pulsation chambers in free communication with each other, a pumping member for each pulsation chamber, valve mechanism for the pulsation chambers, actuating means for said pumping members and yielding means for; supporting the pump whereby it is free to vibrate in any direction 17 A pump having a plurality of pulsation chambers in free communication with each other, a pumping member for each pulsation chamber, valve mechanism for the pulsation chambers, actuating means for said pumping members, the actuating means and the pump being secured together to form a unit of structure and yielding means for supporting the pumping members and the actuating means therefor.

18. In a device of the character described, the combination of a casing forming a vacuum chamber, a separating device in said casing, a base, means for detachably securing said base and said casing together, a pulsation chamber forming part of said base, a motor mounted upon said base, a pulsation her having its outer edgesecured to said pulsation chamber and its inner edge secured to said disk, a pair of connecting rods operatively connected with each of said disks and with the shaft of said motor, an inlet mlve in one of said pulsation chambers, an

outlet valve in the other one of said pulsation chambers and a chamber having restricted openings formed therein located adjacent to said outlet valve.

19. A pump having a plurality of pulsation chambers in free communication with each other, a pumping member for each pulsation chamber, valves for controlling the inlet and outlet to the pulsation chambers, an actuating shaft for the pumping members located between the pulsation chambers, and devices carried by said shaft for simultaneously moving the pumping members in opposite directions.

20. A pump having a plurality of pulsation chambers, tubes connecting said cham bers and forming a free communication between the same, a pumping member for each pulsation chamber, valves for controlling the inlet and outlet to the pulsation cham-- bers, an operating shaftlocated between said pulsation chambers, and devices carried by said shaft for simultaneously moving said pumping members in opposite directions.

21. In a device of the character described,

the combination of a vacuum chamber, a pumping unit, a spring for yieldingly suspending said pumping unit from the top of said vacuum chamber, said vacuum chamber having an opening formed in the top thereof, a flexible diaphragm secured to the top of the vacuumchamber encircling said opening, a flexible diaphragm secured to said pumping unit and inclosing an opening formed in the top of said pumping unit and means for securing the adjacent edges of said diaphragms together to form a passageway.

22. In a device of the character described,

the combination of a vacuum chamber, a

plurality of pulsation chambers rigidly connected together and freely communicating one with the other, means for yield ngly supporting said pulsation chambers within said vacuum chamber, a flexible passageway communicating with one of said pulsation chambers, a motor mounted between said pulsation chambers, vibrating members op,- erated by said motor and valve mechanism located in said pulsation chambers.

23. In a device of the character described,

the combination of a casing forming a vacuum chamber, a removable lid on said casing, a pumping unit-yieldingly suspended from said lid, a flexible exhaust passageway'leacb ing from said pumping unit to an opening formed in said lid, a casing on said lid forming a mufller, an inlet pipe communicating with the lower part of said casing, a separating device secured in said casing, a detachable base forming the lower part of said casing, and a removable member in said base for cleaning the latter.

24. In a pump for vacuum cleaners, the combination with tvvo pumping chambers in constant communication with each other, of reciprocating pumping devices limiting the pumping chambers upon opposite sides, whereby the suction strokes and the delivery strokes of said devices are in opposite directions, driving means connected to said devices so as to operate them simultaneously upon their suction strokes and their delivery strokes, a valve-controlled inlet passage to said chambers, and a valve-controlled outlet passage from said chambers. i

25. In a vacuum cleaning apparatus, the

combination with a vacuum chamber, of

vacuum-creating means connected therewith and comprising a pair of air pumps spaced apart and operative simultaneously and in unison both to draw in or expel air, driving means located between and connected with each of the pumps to operate them in unison and simultaneously, a plurality of air passages, one or more connecting the vacuum chamber with one of the pumps for the air intake and one or more different air passages connecting said pumps, and valves for said pumps, one controlling the admission of air to both of the pumps and the other the exhaust of air from said pumps.

26. In a vacuum cleaning apparatus, the combination of a vacuum chamber, a vacuum-creating means connected therewith and comprising a pair of pumps spaced apart, driving means located between said pumps and operating the pumps in unison simultaneou'sly to draw in or expel air, said pumps having a plurality of air passages, one or more forming an air intake passage and one Or more connecting said pumps, and

valve mechanism in one of said pumps sepa- 'rating the pulsation chamber from another compartment.

27. In a vacuum cleanlng apparatus, the

combination of a vacuum chamber, a 'vacu-' um-creating means connected therewith and comprising a. pair of pumps spaced apart, driving means located between said pumps and operating the pumps in unison simultaneously to draw in or expel air, said pulmps having a plurality of air passages, one vor more forming an air intake passage and one or more connecting said pumps, a valve mechanism in one of said pumpsseparating the pulsation chamiber from another compartment, and another valve mechanism, oneof said valve mechanisms controlling the intake of air and the other the exhaust thereof.

28. In a vacuum cleaning apparatus, the combination of pumping mechanism comprising a. pair of pump chambers spaced apart, a. diaphragm in each of said chambers, one or more tubes connecting said chambers, a motor located between said pumps and connected with the diaphragm's, whereby they are operated in unison, an inlet and an outlet valve for said pump chambers, and a. vacuum chamber having an inlet and connected with the pump chambers through the medium of said inlet valve.

I 29. In a vacuum cleaning apparatus, the combination of a supporting base, pumping mechanism supported thereby and comprising a pair of pump chaunbers spaced apart I one above the other, one or more 'air tubes connecting said chambers and forming pillars for supporting the upper chamber, a diaphragm in each of said chambers, a motor supported on said base between said chambers and having a driving shaft provided with a pair of oppositely disposed eccentrics, connecting rods between said eccentrics and diaphragms, an inlet and an outlet valve for said chambers, and a vacuum chamber supported above said pump chambers and having an outlet communicating with said inlet valve.

30. In a vacuum cleaning apparatus, the combination of a sup-porting base, pumping mechanism supported thereby and comprising a pair of pump chambers spaced apart one above the other, one or more air tubes connecting said chambers and forming pillars for supporting the upper chamber, a

, diaphragm in each of said chambers, a motor supported on said base between said chambers and having a. driving shaft provided with a pair of oppositely disposed eccentrics, connecting rods between said eccentrics and diaphragms, an inlet and an outlet valve for said chambers, said c-hahnbers having an outlet and an inlet, and a casing supported by said base and inclosing said pumping mechanism and having a vacuum chamber therein above said pump chambers and co-Imnunicating with said inlet valve.

31. In a device of the character described, the combination of a casing forming a vacuum chamber, a. pumping unit located within said vacuum chamber and includingthe combination of a, casing forming a vacuum chamber, a pumping unit located within said vacuum chamber including a motor and apulsation chamber, means for rigidly connecting said motor and said pulsation chamber, flexible \meansfior connecting the pulsation chamber with the exterior of said casing, and means for yieldingly supporting said motor.

33. In a device of the character described, the'combination of a casing forming a vacuum chamber, a pumping unit located within said vacuumchamber and including a puling a. vacuum chamber, a pumping unit within said vacuum chamber, said pumping unit including a pulsation chamber, a'motor, means for rigidly securing said motor a valve inlet leading to said vacuum cham' to said pulsation chamber, said pulsation chamber having a vibrating diaphragm, means for actuating said diaphragm from said motor, said pulsationchamber having her, and a valve outlet, flexible means for connecting said valve outlet with the exterior of said casing, and means for yieldingly supporting said pumping unit. 7

35. In a device of the character described,

the combination of a cylindrical casing, a

bottom'member having an air tight connection with the lower end of said casing and a top member having an air tight connection with the upper end of said casing and forming therewith a vacuum chamber, one of said members having an inlet and the other member having an outlet leading to the exterior of said casing, a pumping unit located within said casing, said pumping unit including a pulsation chamber having a valve outlet, flexible means for connecting said valve outlet with the outlet leading to the exterior of said casing, said pumping unit also including a motorrigidly connect-' ed with the pulsation chamber, said pulsation chamber having a vibrating diaphragm, means for actuating the same from saidmotor, and means for supporting said pum ing unit in, said vacuum chamber, where y the same may yield vertically to the vibrations of the pumping unit;

36. In a device of the character described, the combination of a cylindrical casing, a bottom member'havin an air tight connection with the lower en 9f said casing and a top member having an air tight connection with the upper end of said casing and forming therewith a vacuum chamber, one of said members having an inlet and the other member having an outlet leading to the exterior of said casing, a pumping unit located Within said casing, said pumping unit including a pulsation chamber having a valve outlet, flexible means for connecting said valve outlet with the outlet leading to the exterior of said casing, said pumping unit also including a motor rigidly connected with the pulsation chamber, said pulsation chamber having a vibrating diaphragm, means for actuating the same from said motor, means for supporting said pumping unit, in said vacuum chamber, whereby the same may yield vertically to the vibrations.

of the pumping unit, and a separatorwithin said casing and extending from wall to wall thereof between the inlet to said casing and said pumping'unit.

37. In a device of thecharacter described,

the combination of a cylindrical casing, a

bottom member having an air tight connection with the lower end of said casing and a top-member having an air tight connection with the upper end ofsaid casing and forming therewith a vacuum chamber, one of said members having an inlet and the other member having an outlet leading to the exterior of said casing, a pumping unit located within said casing, said pumping unit including a pulsation chamber having a valve outlet, flexible means for connecting said valve outlet with the outlet leading to the exterior of said casing, said pumping unit also Including a motor rigidly connected with the pulsation chamber, said pulsation chamber having a vibrating diaphragm, means'for actuating the same from said mo-- tor, means for supporting said pumping unit in saidvvacuum chamber, whereby the same mayyield vertically to the vibrations of the pumping unit, and a muffler for the outlet from said casing.

38. In a device of the character described, f

the combination of a casing forming a vacuum chamber, a pumping unit located within said vacuum chamber and including two pulsation chambers rigidly connected together and having valve connections with i 'said vacuum chamber, a flexible diaphragm for each pulsation chamber, a motor havin its supporting base rigidly connected to sai V pulsation chambers, means for vibrating said diaphragm from said motor, non-rigid means for connecting the pulsation chamber with the exterior of'the casing, and means for supporting said pumping unit in said vacuum chamber, whereby thg same may yield vertically to the vibrations of the pumping .unit.

39. In a device of the character described,

the combination of a casing, a pumping unit located Within said casing, including a motor and a pulsation chamber, means for rigidly connecting said motor and said pulsa-' tion chamber, means for connecting the pulsation chamber with the exterior of said casing, and means for yieldingly supporting said motor and pulsation chamber, said means for connecting said chamber with the exterior of the casing being so constructed as to permit the motor and ing means.

In testimony whereof I affix my presence of two witnesses.

' HOWARD SM Witnesses:

GEO. H. WEIDNER, M. R. CLEELAND.

si 1n pulsation cham- 10 her to move freely on its "yielding supportgnature ALL. 

